Company hired me for 8 months at a subsistence salary as an accountant. I accepted cos I was in a needy situation. Asked for 30% increase on August, they refused since believed I would not have been gone anywhere.
They didn't know I had 2 offers parked and I resigned.
They found themself suddenly without accountant, struggled to find new one (losing time and energy) and they get new one on emergency, paying him 180% more than me and losing even more time for training.
What I learned: Taking your revenge is priceless!!